IDEAYA Biosciences IDYA Insider Ownership

NASDAQ IDYA
$39.76 -0.21 (-0.53%)
As of: Sep 4, 2026 · 11:49 AM EDT

Insider Holdings by Owner

925.10K Shares

Insider Ownership Statistics

as of 31 Dec, 2025
Insider Ownership
0.263%
-0.425% pp QoQ
Shares Held by Insiders
233.15K
filed for Dec 2025
-62.25% QoQ
Shares Outstanding
88.58Mn
88,583,767 shares
Direct Holdings
233.15K
Indirect: 0
Net Shares Traded (QoQ)
-384.50K
net selling in Dec 2025
Insiders Holding Shares
7
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest
Average ownership
Peak ownership

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter
Net over range
Buying quarters

Insider Ownership Summary

Quarter ending 31 Dec, 2025

IDYA's three largest insider shareholders as of August 29, 2026 are Yujiro S Hata (President And Ceo, 690.70K shares), Michael P. Dillon (Svp, Chief Scientific Officer, 78.79K shares), Jason Throne (Chief Legal Officer, 63.48K shares).

Form 4 Holdings

Insiders Holding IDYA

Insiders 7
Shares held 925.10K
Of outstanding 1.04%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Yujiro S Hata President And Ceo 690,695 0 690,695 74.7% 19 Feb, 2025
2 Michael P. Dillon Svp, Chief Scientific Officer 78,789 0 78,789 8.5% 06 Oct, 2021
3 Jason Throne Chief Legal Officer 63,484 0 63,484 6.9% 27 Jun, 2024
4 Jeffrey Stein Director 54,281 0 54,281 5.9% 02 Mar, 2026
5 Briseno Andres Ruiz Chief Accounting Officer 26,466 0 26,466 2.9% 09 Jul, 2026
6 Paul A. Stone Chief Financial Officer 9,303 0 9,303 1.0% 31 Aug, 2023
7 Douglas B. Snyder Svp, General Counsel 2,080 0 2,080 0.2% 02 Feb, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

871 Insider Transactions

Source SEC Form 4
Latest quarter Dec 2025
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
07 Jul, 2026 Briseno Andres Ruiz Chief Accounting Officer Acquired M 9,550 $12.86 $122.81K 36,016 Direct
07 Jul, 2026 Briseno Andres Ruiz Chief Accounting Officer Disposed S 9,550 $40.01 $382.13K 26,466 Direct
07 Jul, 2026 Briseno Andres Ruiz Chief Accounting Officer Disposed M 9,550 $0.00 $0 19,200 Direct
16 Jun, 2026 Catherine J Mackey Director Acquired A 20,000 $0.00 $0 20,000 Direct
16 Jun, 2026 Wendy L Yarno Director Acquired A 20,000 $0.00 $0 20,000 Direct
16 Jun, 2026 Scott W Morrison Director Acquired A 20,000 $0.00 $0 20,000 Direct
16 Jun, 2026 Malcolm Garret Hampton Director Acquired A 20,000 $0.00 $0 20,000 Direct
16 Jun, 2026 Jeffrey Stein Director Acquired A 20,000 $0.00 $0 20,000 Direct
16 Jun, 2026 Terry J Rosen Director Acquired A 20,000 $0.00 $0 20,000 Direct
02 Mar, 2026 Jeffrey Stein Director Acquired P 50,000 $32.96 $1.65Mn 54,281 Direct
02 Mar, 2026 Jeffrey Stein Director Acquired P 50,000 $32.96 $1.65Mn 54,281 Direct
29 Nov, 2024 Briseno Andres Ruiz Officer Acquired A 682 $23.26 $15.86K 25,213 Direct
30 Jan, 2026 Stuart Dorman Chief Commercial Officer Acquired A 155,000 $0.00 $0 155,000 Direct
30 May, 2025 Douglas B. Snyder Svp, General Counsel Acquired A 1,039 $16.91 $17.57K 1,039 Direct
30 Jan, 2026 Michael Anthony White Chief Scientific Officer Acquired A 190,000 $0.00 $0 190,000 Direct
30 Jan, 2026 Yujiro S Hata President And Ceo Acquired A 600,000 $0.00 $0 600,000 Direct
30 Jan, 2026 Michael Anthony White Chief Scientific Officer Acquired A 190,000 $0.00 $0 190,000 Direct
29 Nov, 2024 Briseno Andres Ruiz Officer Acquired A 682 $23.26 $15.86K 25,213 Direct
29 Nov, 2024 Briseno Andres Ruiz Officer Acquired A 682 $23.26 $15.86K 25,213 Direct
30 Jan, 2026 Michael Anthony White Chief Scientific Officer Acquired A 190,000 $0.00 $0 190,000 Direct